The Westinghouse WGen11500TFc is the better portable generator overall, rated 4.3 to 4.2. The Westinghouse WGen11500TFc leads on value and starting. The Generac GP9500E Tri Fuel EFI wins on run time. The Generac GP9500E Tri Fuel EFI costs $100 less ($1,399 vs $1,499).
A large tri-fuel generator with cleaner-than-usual power for whole-home backup through a 50 A transfer switch. Best for homeowners with a natural gas line who want to run electronics safely.
Amazon $1,499A large tri-fuel generator with fuel injection for whole-home backup, and the version to buy in California. Elsewhere the carbureted GP9500E does the same job for less.
Amazon $1,399Prices were last checked October 28, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every large portable generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Westinghouse WGen11500TFc | Generac GP9500E Tri Fuel EFI |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 70 $0.13 per running watt | 60 $0.15 per running watt |
| Run time 15% | 55 9.5 hours on a tank at 50% load | 65 10.5 hours on a tank at 50% load |
| Fuel options 15% | 100 gasoline, propane or natural gas | 100 gasoline, propane or natural gas |
| Home hookup 15% | 100 240 V outlet for a transfer switch | 100 240 V outlet for a transfer switch |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 67 3-year warranty | 67 3-year warranty |
| Starting 5% | 100 electric start with a remote fob or app | 80 push-button electric start |
| Westinghouse WGen11500TFc | Generac GP9500E Tri Fuel EFI | |
|---|---|---|
| Output | ||
| Gasoline | 11,500 W running, 14,500 W starting | 9,500 W running, 12,500 W starting |
| Propane | 10,500 W running, 13,500 W starting | 8,550 W running, 11,250 W starting |
| Natural gas | 9,500 W running, 12,000 W starting | 7,000 W running, 9,000 W starting |
| Outlets | 4 × 120 V, L14-30, 14-50, USB | 2 × 120 V, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | No | No |
| Total harmonic distortion | under 5% | - |
| Price per watt | $0.13 | $0.15 |
| Fuel and run time | ||
| Fuel | Gasoline, propane, natural gas | Gasoline, propane, natural gas |
| Tank | 9.5 gal | 7.5 gal |
| Run time (gasoline) | 9.5 hr at 50% load | 10.5 hr at 50% load |
| Run time (propane, 20 lb tank) | 7 hr | 5 hr |
| Engine | 550 cc | 500 cc |
| Noise and safety | ||
| Rated noise | 74 dBA | - |
| CO shutoff | Yes | Yes |
| CARB compliant | No | Yes |
| Build | ||
| Starting | Remote, electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 27.2 x 26.1 x 26.5 in | 27.2 x 26.94 x 27 in |
| Weight | 230 lb | 227 lb |
| Warranty | 3 years | 3 years |
| Released | 2023-11 | 2025-03 |
